1. when you buy beer and you expect to have that beer in the fridge and it is gone
2. when you are at an establishment that sells beer, and they are out of the beer that you want or do not have decent beer
3. when a co-worker takes beer that is meant for you to sample

One of the beer reps dropped off some samples for me to try and a co-worker took off with them. I am so beerritated.